Three months after he was employed as a poultry worker, a 48-year-old man developed involuntary jerks of his right first, fourth, and fifth fingers, paraesthesiae, weakness, and eventually wasting of the first dorsal interosseous muscle. His job entailed repetitive lifting of boxes weighing 10-25 kg with flexion of the elbow, pronation of the forearm, and ulnar deviation of the wrist. A nerve conduction study indicated ulnar neuropathy just distal to the elbow. Surgery at this level alleviated the symptoms, but shortly after his return to work, he changed jobs because of aggravation.